天然气地球科学

• 天然气地质学 • 上一篇    下一篇

松辽盆地扶新隆起带南部青山口组超压特征及油气地质意义

任丽华1,2,代俊杰1,林承焰1,2,曹铮1   

  1. 1.中国石油大学(华东)地球科学与技术学院,山东 青岛 266580;
    2.山东省油藏地质重点实验室,山东 青岛 266580
  • 收稿日期:2017-05-25 修回日期:2017-06-24 出版日期:2017-07-10 发布日期:2017-07-10
  • 通讯作者: 代俊杰(1990-),男,河南周口人,硕士研究生,主要从事油气储层地质及油藏描述研究. E-mail:daijj1991@126.com.
  • 作者简介:任丽华(1979-),女,山东东营人,副教授,博士,主要从事储层地质学及油藏描述、油气地质与勘探研究与教学工作. E-mail:rlh_79@163.com.
  • 基金资助:

    国家科技重大专项(编号:2017ZX05009-001);中央高校基本科研业务费专项资金(编号:15CX06012A)联合资助.

Characteristics of overpressure and its geological significance for hydrocarbon of Qingshankou Formation in southern Fuxin Uplift,Songliao Basin

Ren Li-hua1,2,Dai Jun-jie1,Lin Cheng-yan1,2,Cao Zheng1   

  1. 1.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;
    2.Shandong Province Key Laboratory of Reservoir Geology,Qingdao 266580,China
  • Received:2017-05-25 Revised:2017-06-24 Online:2017-07-10 Published:2017-07-10

摘要:

扶新隆起带南部青山口组普遍发育超压,超压与源下油气成藏关系密切。根据录井、钻测井及室内分析测试等资料,结合沉积埋藏史及生烃史,对该区青山口组超压成因、分布及控制因素进行了研究。结果表明:青山口组超压主要分布在青一段、青二段,“层控”效应明显,超压层测井响应具高声波时差、低密度、低电阻率的特征;下斜坡区超压为欠压实作用与干酪根生烃作用综合作用的结果,属二元成因型超压,而上斜坡区超压则以欠压实作用为主导,属单一成因型超压;单井压力剖面呈钟形,自上而下,压力系数与剩余压力均呈递增性变化;纵向上,青二段压力系数为1.2~1.65,剩余压力为2.5~9MPa,表现为低—中超压,青一段压力系数为1.5~1.85,剩余压力为4.5~11MPa,表现为中—高超压,超压极值分布在青一段;平面上,自长岭凹陷至扶新隆起带方向,随着埋深变浅,超压强度减弱,下斜坡区超压明显高于上斜坡区,剩余压力高值中心主要集中在R48井、R39井及R26-1井等井区;青山口组超压分布呈现较强的非均质性,这种非均质性主要受沉积埋藏速率、暗色泥岩厚度及品质、超压层埋深和断层启闭性等因素控制。超压特征研究可为扶新隆起带南部扶余油层油气成藏认识、盖层封闭性能评价等提供依据。

关键词: 超压成因, 超压分布, 剩余压力, 控制因素, 青山口组, 扶新隆起带, 松辽盆地

Abstract:

Overpressure is common in Qingshankou Formation of southern Fuxin Uplift and is closely related to hydrocarbon accumulation for underlying reservoirs below Qingshankou source rocks.Based on data from cutting logging,drilling,well logging and laboratory analysis,the causes,spatial distribution and controlling factors of overpressure in Qingshankou in southern Fuxin Uplift have been studied combined with burial history and hydrocarbon generation history.The results show that overpressure is mainly distributed in K2qn1 and K2qn2 of Qingshankou Formation and is obviously controlled by strata.The overpressure layer is characterized by high acoustic transit time,low density and low resistivity.The overpressure is contributed by both disequilibrium compaction and hydrocarbon generation and possesses binary genesis characteristics in lower slope zone,while in upper slope zone,it is dominated by disequilibrium compaction and possesses single genesis characteristics.The pore pressure profile of single well is bell-shaped and both pressure coefficients and excessive pressure increase with depth.Longitudinally,pressure coefficients of K2qn2 range from 1.2 to 1.65 and excessive pressure ranges from 2.5 to 9 MPa,which suggests low- and medium-intensity overpressure.Whereas pressure coefficients of K2qn1 range from 1.5 to 1.85 and excessive pressure ranges from 4.5 to 11 MPa,which is characterized by medium- and high-intensity overpressure.And the extremum of overpressure occurs in the K2qn1 Formation.On the plane,the intensity of overpressure decreases with the decrease of the buried depth from the Changling Sag to the Fuxin Uplift and the intensity of overpressure in the lower slope zone is apparently higher than that in the upper slope zone.And the high-value center of excessive pressure is mainly concentrated in Well R48 fields,Well R39 fields and Well R26-1 fields.The overpressure distribution of Qingshankou Formation displays strong heterogeneity,which is mainly controlled by depositional rate,thickness and quality of dark mudstone,burial depth and opening/closing property of faults.The study of overpressure characteristics can promote the understanding of hydrocarbon migration and accumulation in Fuyu oil layer and have a great significance on evaluating sealing capability of caprock in southern Fuxin Uplift.

Key words: Overpressure mechanism, Overpressure distribution, Excessive pressure, Controlling factors, Qingshankou Formation, Fuxin Uplift, Songliao Basin

中图分类号: 

  • TE122.1

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